# US 5,350,658 A · Method of forming fixed images comprising simultaneous transfer and fixing of image > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,350,658 A - Document ID: US5350658A - Status: Granted - Kind: A - Application number: 07/941,324 - Filed: 1992-09-04 - Granted: 1994-09-27 - Earliest claimed: 1991-09-07 - Assignees: Kao Corporation - Inventors: Shin-ichiro Yasuda; Kuniyasu Kawabe; Mitsuhiro Sasaki - Web page: https://patentgrep.com/patent/US5350658A ## CPC - G03G 13/16: of a toner pattern, e.g. a powder pattern - G03G 9/09328: {obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds} - G03G 13/20: Fixing, e.g. by using heat - G03G 15/24: whereby at least two steps are performed simultaneously - G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY ## Abstract A method of forming fixed images including uniformly charging a photoconductor selectively exposing the photoconductor to light, developing an electrostatic latent image whereby a toner is applied to the electrostatic latent image formed on the photoconductor to form a visible image, transferring the formed visible image to a recording medium, and fixing the transferred visible image onto the recording medium, in which the toner is a thermally dissociating encapsulated toner, the photoconductor is a heat-resistant photoconductive film belt, and the transferring process and the fixing process are simultaneously carried out on the heat-resistant photoconductive film belt at a temperature of from 40.degree. to 120.degree. C. ## Claims ### Claim 1 A method of forming fixed images comprising uniformly charging a heat resistant photoconductive film belt; selectively exposing said heat resistant photoconductive film belt to light to form an electrostatic latent image; developing said electrostatic latent image whereby an encapsulated toner is applied to said electrostatic latent image formed on said heat resistant photoconductive film belt to form a visible image; transferring said formed visible toner image to a recording medium; and fixing said transferred visible toner image onto said recording medium, wherein said transferring and fixing process steps are simultaneously carried out on said heat-resistant photoconductive film belt at a temperature of from 40.degree. to 120.degree. C. ### Claim 2 (depends on 1) The method according to claim 1, wherein said heat-resistant photoconductive film belt comprises a photoconductor selected from the group consisting of a silicon photoconductor, a zinc oxide photoconductor and an organic photoconductor in a binder, wherein said binder for said photoconductor has a glass transition point of not less than 100.degree. C. ### Claim 3 (depends on 1) The method according to claim 1, wherein said heat-resistant photoconductive film belt and said recording medium are inserted simultaneously between a heat roller and a pressure roller in the transfer and fixing of said visible toner image. ### Claim 4 (depends on 3) The method according to claim 3, further including a cleaning device juxtapositioned to said heat roller. ### Claim 5 (depends on 1) The method according to claim 1, wherein said visible toner image to be transferred to said recording medium is preheated while on said heat-resistant photoconductive film belt, and following preheating of said visible toner image, said heat-resistant photoconductive film belt and said recording medium are inserted simultaneously between two pressure rollers in the transfer and fixing of said visible toner image. ### Claim 6 (depends on 5) The method according to claim 5, further including a cleaning device juxtapositioned to at least one of said pressure rollers. ### Claim 7 (depends on 5) The method according to claim 5, wherein said visible toner image is preheated to a temperature of from 40.degree. to 120.degree. C. ### Claim 8 (depends on 1) The method according to claim 1, wherein a nip pressure during said simultaneous image transfer and fixing is from 0.1 to 4 kg/cm. ### Claim 9 (depends on 1) The method according to claim 1, wherein said encapsulated toner comprises a heat-fusible core material containing at least a coloring agent and a shell formed thereon so as to cover the surface of the core material, wherein the main component of the shell is a resin prepared by reacting: (A) an isocyanate and/or isothiocyanate compound comprising: (1) 0 to 30 mol % of a monovalent isocyanate and/or isothiocyanate compounds, and (2) 100 to 70 mol % of at least a divalent isocyanate and/or isothiocyanate compounds with (B) an active hydrogen compound comprising: (3) 0 to 30 mol % of a compound having one active hydrogen atom reactive with the isocyanate and/or isothiocyanate groups and (4) 100 to 70 mol % of a compound having at least two active hydrogen atoms reactive with the isocyanate and/or isothiocyanate groups at a molar ratio of the component (A) to the component (B) of between 1:1 and 1:20, and wherein at least 30% of all of the linkages formed from the isocyanate or isothiocyanate groups are thermally dissociating linkages. ### Claim 10 (depends on 9) The method according to claim 9, wherein said thermally dissociating linkages are derived from reacting phenolic hydroxyl and/or thiol groups with the isocyanate and/or isothiocyanate groups. ### Claim 11 (depends on 9) The method according to claim 9, wherein said heat-fusible core material comprises a thermoplastic resin as its main component, whose glass transition point is 10.degree. C. to 50.degree. C. ### Claim 12 (depends on 9) The method according to claim 9, wherein the softening point of said encapsulated toner is from 80.degree. to 150.degree. C.